Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

None of these
Left hand
Both A and B
Right hand

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Equally serious in both types of materials
Seriousness would depend on other factors

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